<template>
  <view>
    <!-- 搜索 -->
    <search />
    <!-- 分类 -->
    <view class="category">
      <!-- 顶级分类 -->
      <view class="sup">
        <scroll-view scroll-y>
          <text
            :class="{ active: activeIndex === index }"
            @click="active(index)"
            v-for="(item, index) in categoryList"
            :key="item.cat_id"
          >
            {{ item.cat_name }}
          </text>
        </scroll-view>
      </view>
      <!-- 子级分类 -->
      <view class="sub">
        <scroll-view scroll-y>
          <!-- 封面图 -->
          <image src="http://static.botue.com/ugo/uploads/category.png" class="thumb"></image>

          <view class="children" v-for="item in subCategoryList" :key="item.cat_id">
            <view class="title">{{ item.cat_name }}</view>
            <!-- 品牌 -->
            <view class="brands">
              <navigator
                v-for="brand in item.children"
                :key="brand.cat_id"
                :url="`/subpkg/pages/list/index?query=${brand.cat_name}`"
              >
                <image :src="brand.cat_icon"></image>
                <text>{{ brand.cat_name }}</text>
              </navigator>
            </view>
          </view>
        </scroll-view>
      </view>
    </view>
  </view>
</template>

<script>
// 二级渲染
// 1.利用计算属性 计算出二级分类
// 2. v-for渲染
import search from '@/components/search';

export default {
  data() {
    return {
      categoryList: [],
      activeIndex: 0
    };
  },
  computed: {
    subCategoryList() {
      // 检测一下一级分类是否有children
      if (this.categoryList[this.activeIndex]) {
        return this.categoryList[this.activeIndex].children;
      }
      return [];
    }
  },
  onLoad() {
    this.getGategoryList();
  },
  methods: {
    async getGategoryList() {
      const res = await uni.$http.get('/api/public/v1/categories');
      if (res.data.meta.status !== 200) return uni.$showToast();
      this.categoryList = res.data.message;
    },
    // 点中激活
    active(index) {
      this.activeIndex = index;
    }
  },
  components: {
    search
  }
};
</script>

<style scoped lang="scss">
scroll-view {
  height: 100%;
}

.category {
  display: flex;
  width: 100%;
  position: absolute;
  top: 100rpx;
  bottom: 0;

  .sup {
    width: 196rpx;
    background-color: #f4f4f4;

    text {
      display: block;
      height: 100rpx;
      text-align: center;
      line-height: 100rpx;
      font-size: 27rpx;
      color: #333;
      border-bottom: 1rpx solid #eee;

      &:last-child {
        border-bottom: none;
      }

      &.active {
        background-color: #fff;
        color: #ea4451;
        position: relative;

        &::before {
          content: '';
          display: block;
          width: 8rpx;
          height: 60rpx;
          transform: translateY(-50%);
          background-color: #ea4451;

          position: absolute;
          left: 0;
          top: 50%;
        }
      }
    }
  }

  .sub {
    flex: 1;
    padding: 20rpx 18rpx;

    .thumb {
      width: 100%;
      height: 180rpx;
    }

    .children {
      text-align: center;
      color: #333;

      .title {
        display: inline-block;
        margin: 40rpx 0 20rpx;
        font-size: 30rpx;

        &::before {
          content: '/';
          margin-right: 20rpx;
          color: #666;
        }

        &::after {
          content: '/';
          margin-left: 20rpx;
          color: #666;
        }
      }
    }

    .brands {
      display: flex;
      flex-wrap: wrap;

      navigator {
        width: 33%;
        margin-bottom: 20rpx;
      }

      image {
        width: 120rpx;
        height: 120rpx;
      }

      text {
        display: block;
        font-size: 24rpx;
      }
    }
  }
}
</style>
